hello sir I am preparing for jee but my friend knows my father mother name and date of birth also and he got my application number and he open my result then what can I do?? plz sir suggest something so he not capable to open my result

As NTA have no other options available, you can't do any settings which may stop this. But you can surely file complaint in cyber cell this is because this a bridging of privacy. Now as you have also done a mistake by providing the application number. Its always referred by NTA that you shouldn't share that with anyone. Thus I would recommend you have nothing to do in terms of settings and if you want you can file a complaint but it will not be that beneficial as he/she isn't doing any harm to your details although your friend may get scolded or at least be provided warning by the cyber cell. This is all you can do.

I hope this answer helps. All the very best for your future endeavors!